W90N745CD Datasheet, PDF (72/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
Configuration Registers（SDCONF0/1）
The configuration registers enable software to set a number of operating parameters for the SDRAM
controller. There are two configuration registers SDCONF0、SDCONF1 for SDRAM bank 0、bank 1
respectively. Each bank can have a different configuration.
REGISTER
SDCONF0
SDCONF1
ADDRESS
0xFFF0_1008
0xFFF0_100C
R/W
DESCRIPTION
R/W SDRAM bank 0 configuration register
R/W SDRAM bank 1 configuration register
RESET VALUE
0x0000_0800
0x0000_0800
31
30
29
23
22
21
BASADDR
15
14
13
MRSET RESERVED AUTOPR
7
6
5
COMPBK
DBWD
28
27
BASADDR
20
19
12
11
LATENCY
4
3
COLUMN
26
25
24
18
17
16
RESERVED
10
9
8
RESERVED
2
1
0
SIZE
BITS
[31:19]
[18:16]
[15]
[14]
[13]
[12:11]
BASADDR
RESERVED
MRSET
RESERVED
AUTOPR
LATENCY
DESCRIPTION
Base address pointer of SDRAM bank 0/1
The start address is calculated as SDRAM bank 0/1 base pointer
<< 18. The SDRAM base address pointer together with the “SIZE”
bits constitutes the whole address range of each SDRAM bank.
-
SDRAM Mode register set command for SDRAM bank 0/1
This bit set will issue a mode register set command to SDRAM.
-
Auto pre-charge mode of SDRAM for SDRAM bank 0/1
Enable the auto pre-charge function of external SDRAM bank 0/1
0 = Auto pre-charge
1 = No auto pre-charge
The CAS Latency of SDRAM bank 0/1
Defines the CAS latency of external SDRAM bank 0/1
LATENCY [12:11]
MCLK
0
0
1
0
1
2
1
0
3
1
1
REVERSED
Publication Release Date: September 22, 2006
- 67 -
Revision A2